Shouldy Example

gistfile1.cs

using System;
using System.Collections;
using System.Collections.Generic;
using NUnit.Framework;
using Shouldly;

namespace ClassLibrary1
{
    [TestFixture]
    public class Fixture
    {
        private IEnumerable<Foo> AllTypes
        {
            get
            {
                yield return new Foo(true);
                yield return new Foo(false);
            }    
        }

        [TestCaseSource("AllTypes")]
        public void AllValuesShouldBeBar(Foo foo)
        {
            foo.IsBar.ShouldBe(false);
        }
    }

    public class Foo
    {
        public Foo(bool isBar)
        {
            IsBar = isBar;
        }

        public bool IsBar { get; set; }
    }
}

Done!